* [PATCH] ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control
@ 2020-08-10 13:31 Kai-Heng Feng
2020-08-10 14:03 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: Kai-Heng Feng @ 2020-08-10 13:31 UTC (permalink / raw)
To: tiwai
Cc: moderated list:SOUND, Andrew Oakley, open list, Chris Boyle,
Kai-Heng Feng, Alexander A. Klimov
The USB device (0x17aa:0x1046) that support Lenovo P620 rear panel
line-in claim to support volume control, but it doens't seem to have an
AMP, so when line-in volume lowers below 80, nothing gets recorded
anymore.
Disable the volume control to workaround the issue.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
sound/usb/mixer_maps.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index c369c81e74c4..5b43e9e40e49 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -371,6 +371,7 @@ static const struct usbmix_name_map asus_rog_map[] = {
};
static const struct usbmix_name_map lenovo_p620_rear_map[] = {
+ { 19, NULL, 2 }, /* FU, Volume */
{ 19, NULL, 12 }, /* FU, Input Gain Pad */
{}
};
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control
2020-08-10 13:31 [PATCH] ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control Kai-Heng Feng
@ 2020-08-10 14:03 ` Takashi Iwai
0 siblings, 0 replies; 2+ messages in thread
From: Takashi Iwai @ 2020-08-10 14:03 UTC (permalink / raw)
To: Kai-Heng Feng
Cc: moderated list:SOUND, Andrew Oakley, open list, Chris Boyle,
tiwai, Alexander A. Klimov
On Mon, 10 Aug 2020 15:31:06 +0200,
Kai-Heng Feng wrote:
>
> The USB device (0x17aa:0x1046) that support Lenovo P620 rear panel
> line-in claim to support volume control, but it doens't seem to have an
> AMP, so when line-in volume lowers below 80, nothing gets recorded
> anymore.
>
> Disable the volume control to workaround the issue.
>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Thanks, applied.
Takashi
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-08-10 14:03 ` Takashi Iwai
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